That's a great question! In my opinion, some languages have priority. For some languages, I want to reach a C2 level (or at least C1), while for others, B2 is enough for me. For example, I want to learn more than 20 languages, but I understand that I can't reach the same level in every language I study because that's too many, lol. So, for the most important ones – like English, Spanish, Japanese, Chinese, German, Italian, French, Russian, Latvian, Latin, Ancient Greek and Hebrew – I want a high level (C1, or C2 if possible). For the others, B2 is sufficient.